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Abstract <p>The operation of mechanical engineering products operating under conditions of intensive wear at high rotation speeds and loads leads to their inevitable wear and significant metal losses. One of the methods for obtaining wear-resistant surfaces on products, for example, friction pair parts, is the microarc oxidation (MAO) method of aluminum alloys. The method makes it possible to obtain dense hard surface wear-resistant composites based on α-Al<sub>2</sub>O<sub>3</sub> (corundum) and γ-Al<sub>2</sub>O<sub>3</sub>. The structure, composition, and surface quality of the resulting MAO coating significantly affect the performance characteristics of the product surface. This goal of this study was to determine the effects of porosity (10 and 16%) and surface roughness (<i>R</i><sub><i>a</i></sub> equal to 2.7 and 0.51 μm) of MAO composites on D16T alloy on tribological properties and to evaluate the possibility of using MAO coatings in friction pairs, including end seals, under dry friction conditions. Comparative tests have been carried out using an SMT-1 machine under dry friction conditions at a specific pressure in the friction pair, <i>P</i> = 0.5 MPa; the duration of the experiment was 90–91 min for each friction pair. These studies have shown that in many friction pairs various types of damage (destruction) of the coating integrity, as well as deep abrasive wear, occurred. The porosity of the MAO coating in the range of 10–16% at various roughness values does not affect the abrasive wear of the coating. However, a porosity of 10% and a surface roughness of no more than <i>R</i><sub><i>a</i></sub> <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\( \leqslant \)</EquationSource> <!--InorgMat2570067Somov-m1--> </InlineEquation> 0.51 ± 0.12 μm are preferable for achieving better tribological characteristics of surface MAO composites on D16T aluminum alloy.</p>

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A Study of the Tribological Properties of Surface MAO Composites on D16T Alloy

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • O. V. Somov,
  • V. A. Vasin

摘要

Abstract

The operation of mechanical engineering products operating under conditions of intensive wear at high rotation speeds and loads leads to their inevitable wear and significant metal losses. One of the methods for obtaining wear-resistant surfaces on products, for example, friction pair parts, is the microarc oxidation (MAO) method of aluminum alloys. The method makes it possible to obtain dense hard surface wear-resistant composites based on α-Al2O3 (corundum) and γ-Al2O3. The structure, composition, and surface quality of the resulting MAO coating significantly affect the performance characteristics of the product surface. This goal of this study was to determine the effects of porosity (10 and 16%) and surface roughness (Ra equal to 2.7 and 0.51 μm) of MAO composites on D16T alloy on tribological properties and to evaluate the possibility of using MAO coatings in friction pairs, including end seals, under dry friction conditions. Comparative tests have been carried out using an SMT-1 machine under dry friction conditions at a specific pressure in the friction pair, P = 0.5 MPa; the duration of the experiment was 90–91 min for each friction pair. These studies have shown that in many friction pairs various types of damage (destruction) of the coating integrity, as well as deep abrasive wear, occurred. The porosity of the MAO coating in the range of 10–16% at various roughness values does not affect the abrasive wear of the coating. However, a porosity of 10% and a surface roughness of no more than Ra \( \leqslant \) 0.51 ± 0.12 μm are preferable for achieving better tribological characteristics of surface MAO composites on D16T aluminum alloy.